CPC Main Group B01L 9/00 Supporting devices; Holding devices 7 direct subcodes Child Classifications Navigate with arrow keys, Enter to open B01L 9/02 Laboratory benches or tables; Fittings therefor B01L 9/04 Retort stands; Retort clamps B01L 9/06 Test-tube stands; Test-tube holders B01L 9/50 B01L 9/52 B01L 9/54 B01L 9/56